메타데이터
| 항목 |
값 |
| Designation |
C/2018 A4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-05-18T19:21:20.165760Z |
| Orbit solution date (soln_date, UTC) |
2023-05-03T22:42:49Z |
| Obs used |
79 |
| NEO |
- |
| M1 |
8.400 |
| K1 |
22.250 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-01-15.0000000 |
| e |
0.80435873 |
| q (au) |
2.402567 |
| a (au) |
12.280471 |
| i (deg) |
3.148025 |
| Ω (om, deg) |
97.634759 |
| ω (w, deg) |
356.135345 |
| M (ma, deg) |
357.164531 |
밝기
산란 + 전체 선형
$$
M_a = (10.546 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.546 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
16:15:46.00 |
-19:46:35.7 |
HIP 79690 |
18.02 |
| 2026-09-20 12:00 |
16:15:49.87 |
-19:46:48.7 |
HIP 79690 |
17.77 |
| 2026-09-21 00:00 |
16:15:53.79 |
-19:47:01.8 |
HIP 79690 |
17.57 |
| 2026-09-21 12:00 |
16:15:57.77 |
-19:47:15.0 |
HIP 79690 |
17.42 |
| 2026-09-22 00:00 |
16:16:01.80 |
-19:47:28.3 |
HIP 79690 |
17.32 |
| 2026-09-22 12:00 |
16:16:05.89 |
-19:47:41.7 |
HIP 79690 |
17.27 |
| 2026-09-23 00:00 |
16:16:10.04 |
-19:47:55.3 |
HIP 79690 |
17.28 |
| 2026-09-23 12:00 |
16:16:14.24 |
-19:48:09.0 |
HIP 79690 |
17.35 |
| 2026-09-24 00:00 |
16:16:18.49 |
-19:48:22.7 |
HIP 79690 |
17.49 |
| 2026-09-24 12:00 |
16:16:22.79 |
-19:48:36.6 |
HIP 79690 |
17.68 |
| 2026-09-25 00:00 |
16:16:27.15 |
-19:48:50.6 |
HIP 79690 |
17.94 |
| 2026-09-25 12:00 |
16:16:31.57 |
-19:49:04.8 |
HIP 79690 |
18.26 |
| 2026-09-26 00:00 |
16:16:36.03 |
-19:49:19.0 |
HIP 79788 |
17.78 |
| 2026-09-26 12:00 |
16:16:40.55 |
-19:49:33.3 |
HIP 79788 |
17.25 |
| 2026-09-27 00:00 |
16:16:45.12 |
-19:49:47.8 |
HIP 79788 |
16.78 |
| 2026-09-27 12:00 |
16:16:49.74 |
-19:50:02.3 |
HIP 79788 |
16.36 |
| 2026-09-28 00:00 |
16:16:54.42 |
-19:50:17.0 |
HIP 79788 |
16.00 |
| 2026-09-28 12:00 |
16:16:59.14 |
-19:50:31.8 |
HIP 79788 |
15.71 |
| 2026-09-29 00:00 |
16:17:03.92 |
-19:50:46.6 |
HIP 79788 |
15.51 |
| 2026-09-29 12:00 |
16:17:08.75 |
-19:51:01.6 |
HIP 79788 |
15.38 |
| 2026-09-30 00:00 |
16:17:13.62 |
-19:51:16.7 |
HIP 79788 |
15.35 |
| 2026-09-30 12:00 |
16:17:18.55 |
-19:51:31.9 |
HIP 79788 |
15.40 |
| 2026-10-01 00:00 |
16:17:23.53 |
-19:51:47.1 |
HIP 79788 |
15.55 |
| 2026-10-01 12:00 |
16:17:28.56 |
-19:52:02.5 |
HIP 79788 |
15.79 |
| 2026-10-02 00:00 |
16:17:33.64 |
-19:52:18.0 |
HIP 79788 |
16.12 |
| 2026-10-02 12:00 |
16:17:38.77 |
-19:52:33.5 |
HIP 79788 |
16.54 |
| 2026-10-03 00:00 |
16:17:43.95 |
-19:52:49.2 |
HIP 79788 |
17.05 |
| 2026-10-03 12:00 |
16:17:49.17 |
-19:53:05.0 |
HIP 79788 |
17.64 |
| 2026-10-04 00:00 |
16:17:54.45 |
-19:53:20.8 |
HIP 79788 |
18.30 |
| 2026-10-04 12:00 |
16:17:59.77 |
-19:53:36.8 |
HIP 79788 |
19.03 |
| 2026-10-05 00:00 |
16:18:05.14 |
-19:53:52.8 |
HIP 79788 |
19.82 |
| 2026-10-05 12:00 |
16:18:10.56 |
-19:54:08.9 |
HIP 79788 |
20.67 |
| 2026-10-06 00:00 |
16:18:16.03 |
-19:54:25.2 |
HIP 79788 |
21.58 |
| 2026-10-06 12:00 |
16:18:21.54 |
-19:54:41.5 |
HIP 79945 |
21.35 |
| 2026-10-07 00:00 |
16:18:27.10 |
-19:54:57.8 |
HIP 79945 |
20.47 |
| 2026-10-07 12:00 |
16:18:32.71 |
-19:55:14.3 |
HIP 79945 |
19.65 |
| 2026-10-08 00:00 |
16:18:38.36 |
-19:55:30.9 |
HIP 79945 |
18.87 |
| 2026-10-08 12:00 |
16:18:44.06 |
-19:55:47.5 |
HIP 79945 |
18.16 |
| 2026-10-09 00:00 |
16:18:49.80 |
-19:56:04.2 |
HIP 79945 |
17.52 |
| 2026-10-09 12:00 |
16:18:55.59 |
-19:56:21.0 |
HIP 79945 |
16.97 |
| 2026-10-10 00:00 |
16:19:01.43 |
-19:56:37.9 |
HIP 80019 |
15.90 |
| 2026-10-10 12:00 |
16:19:07.31 |
-19:56:54.9 |
HIP 80019 |
14.51 |
| 2026-10-11 00:00 |
16:19:13.23 |
-19:57:11.9 |
HIP 80019 |
13.13 |